Power-operated dump grate



May 20 1924.

E. LlJbHD(5FEP POWER OPERATED DUMP GRATE 24. 1922 2'Shets-Sheet I Filed Oct.

E. LUNDGREN v POWER OPERATED DUMP GRATE I [Via y 20 1924.

Filed Oct.

24 1922 2 Sheets-Sheet 2 lwsai l iii WIN I avwwty [om/v ZZ/NDGEEM Patented May 20, 1-924.

'om'rao STATES rArsm' orrica- EDWIN LUNDG-REN, OF FREDERICK, MARYLAND, ASSIGNOR TO COMBUSTION EN- GINEERING GORPOMTION, OF NEWYOBK, N. Y., A CORPORATION OF NEW YORK.

rownnrormmn DUMP (maria Application filed october 24, 1922. Serial No. 596,574.

To all whom it concern: .Be it known that I, EDWIN LUNDGREN, a citizen of the United States, residing at Frederick, county of Frederick, State of Maryland, have invented a certain new and useful Improvement in PowerOperated Dump Grates, of which the following is a full clear, and exact description.

My invention relates todump, grates and more particularly toower operated dump grates for furnaces o the automatic stoker type, and has for its object to provide a dump grate of this character which is simple, strong and durable in construction, and reliable in operation. v

, The several features ,of the invention will be clearly understood from the following description and accompanying drawings, in which, I Figure 1 is a planview, partly in section, of a power operated dump grate with the dumping member thereof partly broken away, embodying the features of the invention in their preferred form;

partly in elevation, taken. on the line' 2-2 of Fig. 1; i

Fig. 3 is a detail sectional view taken on the line 4-4 of Fig. 2; and

Fig. 4 is a. detail side elevation, partlyin section, of a portion of the mechanism illustrated in Fig.- 2, but with parts shown in a different position. i

he power operated dump grate illustrated in the drawings is provided with the usual dumping mem er 2 which is secured a at one end on a. rock-shaft 4. As shown one end of the rock-shaft extends through and 6, which is mounted on a frame 8 adapted .to be secured to a side wall of the furnace.

The actuating mechanism for the'dumping member comprises an arm 10 having one en secured on the end ofthe rock-shaft 4 and 2 its other end bifurcated so as to embrace a block 12 mounted on a horizontal piston rod 14 between c'ollars.16 and 18 secured on the rod. The block 12 is held from rotary movement. on the rod, but is permitted 'to slide longitudinally between the collars 16 and 18 by means of a suitable key 20. A latch pawl 22 is pivotally mounted at one end on a pin 24 secured to the supporting frame 8 and its free end is weighted and is provided with a latching shoulder 26-which Fig; 2 is a longitudinal sectional view,

is journaled in an adjustable bearing block surface of the'collar 18 to raise the pawl is adapted to engage the rear or left-hand the top of the bracket 30. The piston rod 5 I 14 extends through and is mounted for 'reciprocation in a bearing block 32 secured to the frame 8 and a bearin 34 in av steam cylinder 36. A piston 38 is secured to the rod and is mounted in the steam cylinder, the cylinder being" provided with intake ports 40 and 42 and with exhaust ports 44 and 46. The intake ports are adapted to be alternately opened and closed by means of a valve 48 and the exhaust orts are adapted to be alternately opened and closed by means of a valve 50. The valves 48 and 50 are adapted to be simultaneously actuated by means of a lever 52 pivoted at 54 on the steam cylinder and pivotally connected with a'link 58 midway between its ends, the ends of the link being pivotally connected with arms 60 secured to the valve stems.

Upon movement of the piston rod 14 forwardly or toward the right, viewing Fig. 2, the collar 16 by engagement with the rear face of the block 12 will act through the block and the arm 10 to swing the dumping member 2 into its closed or raisedv position as shown in Fig. 2. As the dumping member reaches its closed position the latch-pawl 22 is permitted to drop by gravity so as to bring its latching shoulder'26 back to therear face of the block 12, and thus the dumping member is securely held in closed position by the pawlafter the tension in the steam cylinder releases. Upon rearward movement of the piston rod 14 the pawl 22 is raised out of engagement with the block '12 as shown in Fig. 4 so as t0 permit the-dumping member to swing open by gravity. To provide for this the collar 18 is rounded over and the underside of the pawl 22 is provided with a roll 62 which is engaged by the rounded or cam during the first part of the rearward movement of the is'ton rod. The free end of the latchrpawl 22 is provided with an in-. clined surface 64 so as to enable the block 1,

- Fig. 2. the dumping 12 to'ride'beneath the pawl during the forward movement of the iston.

"From the foregoing it will be apparent that upon moving the hand-operated lever 52 downwardly to the position indicated; in

I member will be automatically released and permitted toi -swing open by gravity; and that upon vmoving the lever 52 upwardly the dumping member will be swung into closed position andse curely locked automatically in this position. In case the dumping member should not be swung completely openby ravity after the latch 22 is released and urin the rearward movement of the piston ro the collar 18 will be brought into en agement thereof or theuscope of the appended claims.

What I claim is: 1 y 1. A dumping deviceof the class described for a furnace having, in combination, a pivotally mounted dumping member capable of being swung into and out of closed position, and. a reciprocating fluid actuated piston and suitable connections for swin ing the dumping member into closed position during the movement of the piston in one direction, for automatically locking the member in said position, and for automatically releasing said member from said connections and permitting it to swing open by gravity upon movement of the piston in the opposite direction.

2. A1 dumping device of the class de-."

scribed for a furnace having, in. combination, a pivotally mounted dumping member capable of being swung. into and out of closed ositiom a reciprocating fluid actuated lston and suitable connections for swinging the dumping member-into closed positiomduringthe movement of the piston in one direction; a device for locking said member in closed position, and means car ried by the iston rod for releasing said device from t edumping member to permit the dumping memberto swin open by ravity during the movement 0 the piston n the opposite direction; -3'. A dumping device of the class de-' scribed for a furnace having, in c'ombina tion, a pivotally mounted dumping member capable of being swung into and out of.

closed position, means for operatin said member comprising an upwardly pro ecting Qarm movable therewith, a reciprocating fluid actuated piston, apiston rod, a block mounted to :slide. onthe rod, a pin and slot connection between the block and the arm,

and a stop member carried'by the piston rod arranged to engage the block to swing the dumping member into closed position with the block 12 and act throng the block to.

and a stop member carried by the piston rod arranged to engage'the block to swing the dumping member into closed position upon movement of the piston in one direccapable .of being swungiinto and out of closed. position, means for operating the dumping member comprising an arm, a

fluid actuated piston, for swinging the dumping member into closed position comprising a block mounted to slide on the rod, a pin and slot connec tion between the block and arm, an abuttion, and means acting automatically to hold a piston rod; means ment carried by the rod and arranged to engage the block to swing the dumping member into closed position when. the rod is moved in one direction, a latch arranged to, engage the block when the dumping member is swung into closed position so as to mg the dumping member into closed position upon movement of the rod in one direction,

\means comprising a gravity actuated latch for lockingthe arm from movement in one direction when the dumping member; is swung into closed position so as to lock'said lock said member in said position, and a v member in said position, and means carried A i movement of the rod in the opposite .direction.

7. A dumping device of the class described for a furnace having, in combination, a pivotally mounted'durnping member capable of being swunginto and out of closed position, means for operating said member the rod for releasing the latch upon comprising an arm, a reciprocating fluid actuated piston, connectlons between the arm and piston for effecting movement of the dumping member into and out of closed position upon movement of the piston in opposite directions, respectively, and means comprising a gravity actuated and automatically controlled latch for locking said arm from movement in one direction when the dumping member is swung into closed position so as to lock said member in said position.

8. A dumping device of the class described for a furnace having, in combination, a pivotally mounted dumping member capable of being swung into and out of closed position, means for operating said member com prising an arm, a reciprocating fluid actu-v ated piston, connections between the arm and piston for swinging the dumping memher into closed position upon movement of the piston in one direction, means comprising a latch acting automatically to lock said arm from movement in one direction when the dumping member 1s swung lnto closed position so as to lock said member m said position, and a member carried by the piston into engagement with the latch during the movement'of the piston in the opposite direction so as to release the latch to enable the dumping memberto be swung open.

9-. A dumping device of the class described for a furnace having, in combination, a rock shaft, a dumping member mounted on't'he rock shaft and capable of being swung by the rock shaft into and out of closed position, an operating arm secured to the rock shaft, a reciprocating fluid actuated piston, connections between the piston and said arm for swinging the dumping member into closed position upon movement of the piston in one direction, a device acting automatically to engage the arm when the dumping member is swung into closed position to lock the member in said position, and means carried by the piston rod for releasing saiddevice from said arm to permit the dumping member to swing open by gravity during the movement of the piston in the opposite direction.

EDWIN LUNDGREN. 

